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This article is about what is forbidden in PHP 7. Xiaobian thinks it is quite practical, so share it with everyone for reference. Let's follow Xiaobian and have a look.

1. Do not use mysql_function

The day has finally come when you don't just "shouldn't" use the mysql_function. PHP 7 has removed them all from the core, which means you need to migrate to the much better mysqli_function, or the more flexible PDO implementation.

2. Don't write junk code

This one may be easy to understand, but it will become increasingly important because PHP 7's speed improvements may hide some of your problems. Don't settle for just the speed of your site, because migrating to PHP 7 makes it faster. As a developer, you should always make sure to load scripts on demand, concatenate them as much as possible, write efficient database queries, use caching as much as possible, and more.

Do not use PHP closing tags at the end of files

You can see that when a file ends with PHP code, most of the core WordPress code removes the PHP tag at the end. In fact, the Zend framework specifically prohibits it. PHP doesn't need the closing tag at the end of the file, and we can remove it to ensure that we don't add any white space at the end.

4. Don't make unnecessary references

I personally don't like passing quotes. I know it's useful sometimes, but in other cases it makes code harder to understand and harder to predict. It is said that some people think it makes code run faster, but according to some PHP senior programmers, this is not true.

An example of why references are bad is PHP's built-in shuffle() and sort(). They modify the original array instead of returning the processed array, which is illogical.

5. Do not execute queries in loops

Executing queries in loops is wasteful. It puts unnecessary stress on your system and may be able to get the same results faster outside the loop. When I have a situation where I need this, I usually use two separate queries to solve the problem, and I use them to build the data array. I then traverse the array without having to execute queries in the process.

Since WordPress works here, it may have some exceptions. Although get_post_meta() fetches a lot of data from the database, you can use it in a loop if you are traversing the metadata of a particular blog post. This is because WordPress actually fetches all the metadata and caches it the first time you invoke it. Subsequent calls use this cached data, no database calls.

The best way to understand this is to read the function documentation and use tools like Query Monitor.

Do not use * in SQL queries

Of course, this is more of a MySQL problem, but we're used to writing SQL code in PHP, so it's all the same. In any case, do not use wildcards in SQL queries if you can avoid them, especially if the database has many columns.

You should specify exactly which rows are needed and only get them. This helps reduce resources used, protect data, and keep things as clear as possible.

For SQL, you need to know all the available functions and test them as fast as possible. Use SQL functions instead of PHP functions when calculating averages, sums, or similar values. If you're unsure of the speed of a query, test it and try some other compilations-then use the best one.

Don't trust user input

Trusting user input is unwise. Always check, filter, escape, check and leave a way out. There are three problems with user data: we developers don't consider every possibility, it's often incorrect, and it could be vandalism. Well-thought-out systems can protect against these threats. Be sure to check for appropriate values using built-in functions like filter_var() and escape (or precompile) when working with databases. WordPress has some functions to solve problems. See article Verification, Escape, and Filtering User Data for details.

8. Don't pretend to be smart

Your goal should be to write elegant code that expresses your intentions more clearly. You may be able to optimize 0.01 seconds from each page by shortening anything to a single word variable, using layers of ternary logic, and other means. Name variables properly, document code, and prioritize clarity over brevity. Even better, use standard object-oriented code, which is more or less a document in itself and doesn't require a bunch of inline values.

Don't reinvent the wheel.

HP has been around for a long time now, and websites have been around longer. Chances are, whatever you need to build, some people have already been built. Don't be afraid to ask for support from others, Github is your friend, Composer is your friend, Packagist is your friend.

From logging tools to color tools, from performance analyzers to unit test frameworks, from Mailchimp API to Twitter Bootstrap, everything is available at the press of a button (or command), so use them!

Don't ignore other languages

If you are a PHP programmer, now is a good time to learn at least HTML, CSS, JavaScript and MySQL. When you can handle these languages better, it's time to relearn JavaScript. JavaScript is not jQuery, and you should learn JavaScript properly to use it more efficiently. I also intend to recommend learning object-oriented PHP, which saves time and gets better at larger code sizes. For languages like C#and Java, they are also easier to understand after you understand OOP. Expand your knowledge by learning about package managers, build scripts, CoffeeScript, LESS, SASS, YAML, scripting engines, and other powerful tools. I strongly recommend you to look at other frameworks, especially Laravel.

Learn how Ruby, RoR, Android, iPhone, and Windows Phone app development works when you use them to excel at tasks. You may think that this is meaningless because it's outside your comfort zone and what you need for your job, but that's what it's all about. Every language has something practical to learn and something new to learn that you've never encountered. It's no accident that all top PHP developers know a lot of other programming languages.

Thank you for reading! About "what are the taboos in PHP7" this article is shared here, I hope the above content can be of some help to everyone, so that everyone can learn more knowledge, if you think the article is good, you can share it to let more people see it!

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